Quantum mechanics is an extremely successful theory that agrees with every experimental
test. However, the principle of linear superposition, a central tenet of the theory, apparently …

Interference with atomic and molecular matter waves is a rich branch of atomic physics and
quantum optics. It started with atom diffraction from crystal surfaces and the separated …

Matter-wave interference experiments provide a direct confirmation of the quantum
superposition principle, a hallmark of quantum theory, and thereby constrain possible …

The quantum superposition principle, a key distinction between quantum physics and
classical mechanics, is often perceived as a philosophical challenge to our concepts of …

The wave nature of matter is a key ingredient of quantum physics and yet it defies our
classical intuition. First proposed by Louis de Broglie a century ago, it has since been …

Recent progress and future prospects of matter-wave interferometry with complex organic
molecules and inorganic clusters are reviewed. Three variants of a near-field interference …

Matter-wave interferometry performed with massive objects elucidates their wave nature and
thus tests the quantum superposition principle at large scales. Whereas standard quantum …

We propose an experimentally accessible, objective measure for the macroscopicity of
superposition states in mechanical quantum systems. Based on the observable …

Decoherence due to contact with a hot environment typically restricts quantum phenomena
to the low temperature limit, k BT/ℏ ω≪ 1 (ℏ ω is the typical energy of the system). Here we …

Quantum theory is incredibly successful, explaining the microscopic world with great
accuracy, from the behaviour of subatomic particles to chemical reactions to solid-state …